Coil and spool construction



BASES May 22, w23.

S. E. JOHANNESEN COIL AND SPOOL CONSTRUCTION Filed Feb. 6, 1920 p Patented -May 22, 1923.

SVEND E. JOHANNESEN, F PITTSFIELD,

Prem oFFlcE.

UNITED STATES MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

COIL AND SPOOL CONSTRUCTION.

Application led February 6, 1920. Serial No. 358,583.

To all 'whom t may concern;

Be it known that I, SvEND E. JOHAN- NESEN, a citizen of the United States, residing at Pittsfield, county of Berkshire, State of Massachusetts, have invented certain new and useful Improvements in Coil and Spool Constructions, of which the following is a specification. My invention relates to a coil and spool construction, and more particularly to the instrumentalities used for forming the coil upon its spool.

One object of my invention is to-form the coil expeditiously upon its spool, and in such a manner that the minimum space be utilized for the coil. Another object is to provide means for preventing the end turn of any layer from slipping down onto the next lower layer. Still another object is to use such a form of conductor that two electrically independent coils, such as two secondaries on a transformer, may be expeditiously wound in one operation. vOther objects and advantages of my invention will appear as the description proceeds. l

In general, my invention comprises the A employment of a spool of a definite configuration, for properly guiding the turns of wire. It is to be understood that this spool may be used both in the case where the turns of wire are placed on the coil by hand, as well as b machines. The most eilicient 'form of win infr, as far as space is concerned, is the so-calIed lgutter winding, or one in which each succeeding layer of .turns is wound in the gutter formed bythe turns in the next `lower layer. Difficulty, however, is usually experienced in preventing the end turn of the layer from dropping down, due to the fact that itris offset by one-half the diameter of the conductor from being directly over the bottom turn. I provide means, such as small hemispherical projections upon the spool, for. furnishing-a support for this end turn at the proper point. I further provide means for definitely deter* mining the place of cross-over of each turn on the bottom layer.

The construction and operation of my invention may be readily understood by reference to the accompanying drawings, in

f which:

Figure l is a perspective view showing the spool that I employ for winding the coil; F ig. 2 is a longitudinal sectional View of the completed coil; Fig. 3 is a view of the coil showing the first completed layer of turns; I1` ig. i is a view of the coil showing the sccond layer of' turns completed, and Fig. 5 is a cross-sectional view similar to Fig. 2 showing a modification.

Referring now more in detail'to the drawings, wherein like reference numerals refer to like parts throughout, the spool 11 has the ordinary conventional flanges 12 at each end thereof. This spool may be used only while the coil is being wound for forming it, or may be incorporated as a part of the coil. The manner in which the spool is wound is Shown clearly in Figs. 3 and 4. The first layer is started at 13, Fig. 3, and each turn thereof crosses over tothe next turn at the point marked 14. In this way, each turn makes practically a complete circle all iu one plane, instead of describing a helix. Such a helical coil, however,.could be used with my invention, as well as the kind I illustrate. In order to determine the point 14 wherethe cross-over is to take place for the first layer of turns, I make use of some means, such as a diagonally extending narrow rid e 15.

` This ridge has the desired effect of facllitating the cross-over at that point. It is only in the first layer that a special guide such as a ridge for forming a definite cross-over is needed; in succeeding layers the turns are kept from being wound in a helix by winding them in the gutters of the lower'layer. These gutters form a sufficiently good guide for this purpose.

Each successive turn on the bottom layer is now placed on in exactly the same way. The distance between flanges 12 is such that one-half space is left as indicated by dimen-y side, then rises gradually and forms the beginning D ofthe second layer. Attention is called to Fig. 2, showing how the projec-v tion 1G supports this first turn of the second layer and prevents it from slipping down.

The second layer of turns is n ow placed on in the manner clearly shown in Fig. 4.' The manipulation of the last turn of this layer is precisely the same as the last turn of the first layer. In this case the projection 17 is made use of in the same Way as projection 16. Each succeeding layer is then placed on, and other projections, such as 18, 19 and 20, are utilized for these layers in the same way as projections 16 and 17. Apertures 21 and 22 are provided for the leading-in wires of the coil.

In Fig. 5 I have shown my invention as applied to a transformer Winding or the like, wherein more than one electrically` independent coils are wound on one spool. Iny

order to be able to use the improvements I have described above efficiently with such a' coil, both conductors are` wound simultaneously, although electrically independent. The two conductors 23 are approximately semi-circular in cross sectionand are separated by flat insulation 24. Both conductors are covered, for example, by the insulation 25, `which thus'serves the double purpose of insulating the turns from each other and also to unite mechanically the two independ# ent conductors. Thus the two coils may be Wound on the spool in one operation.

In both of the forms illustrated, the need of a larger support for the endturns than the project-ions 16, 17, etc., is obviated by locating these projections Where the end turn begins.

lVhile I have shown in the accompan ing drawings the preferred embodiments o my device, 1ny invention is not limited thereto, and I aim in the appended claims to embrace all modifications falling fairly Within the scope of my invention. v

What I claim as new and desire to secure by Letters Patent of the United States, is,-

`1. In a spool, a spool body adapted to be wound With-turns of Wire, flangest-hereon,

and projections carried on those surfaces of said flanges which are adjacent the turns of vire for supporting the end turns of each ayer. I

2. In a spool, aspool body adapted to be Wound with turns of Wire, flanges thereon, and a diagonal ridge on the outer'surface of said spool body, running from one flange to another, to determine the cross-over point of each succeeding turn on the first layer of the Winding.

3. In a spool, a spool body adapted to be wound with turns of wire, flanges thereon, means comprising projections carried by the flanges for supporting the end turns of each layer, and a diagonal ridge on said spool body for determining the cross-over point of each succeeding turn on the first layer of the Winding.

4. In a spool, a spool body adapted to be wound with turns of wire, flanges thereon, hemispherical projections carried by the flange surfaces for supporting the end turns, said projections having a diameter e ual to that of the Wire which is to be woun upon said spool, and so arranged that there is one projection for each layer of the winding, and located on opposite flanges for the alternate layers.

5. In a coil, a spool body, a compound conductor of circular shape formed of two electrically independent conductors mechanically united Wound thereon, flanges for said spool body, and projections carried on those surfaces of said flanges which are adjacent the turns of wire, for supportingthe end turns. j

G. The combination with a gutter wound coil of a flanged member for supporting` the same, provided with projections on those surfaces of the flanges which are adjacent the turns of wire, for supporting the end turns of each layer.

7. The combination with a gutter Wound coil of a spool for supporting the same, said spool having a diagonal ridge on the outer surface of its body running from one flange to another, to determine the cross-over point of each succeeding turn on the first layer of the Winding.

8. The combination with a gutter wound coil of a. flanged member for supporting the same provided with projections alternately disposed on the respective flanges and posi- `tioned to engage the outside of the last turn of each'layer to prevent it from spreading, thedistance between the flanges being such that a "space equal to substantially one-half the diameter of the Wire is left between the last turn in each layer and the adjacent flange, the respective projections r filling these spaces at a point in the Winding.

In witness whereof, I have hereunto set my hand this the third (3rd) day of February, 1920.

SVEND E. J OHANNESEN. 

